# ONE Engine Deterministic Text Segmentation – Head Lines (p=16, Tier 2)

> ONE Engine Deterministic Text Segmentation – Head Lines (p=16, Tier 2) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0008/call, status unknown (last checked 2026-10-15).

Splits input text into lines and returns the first 16 lines, with Tier 2 diagnostic metadata included in the response.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v11/text-segment/head-lines/p6/t2?utm_source=zero.xyz
- Price: $0.0008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/one-engine-deterministic-text-segmentation-head-lines-p-16-tier-2-6a87fdc1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8slLaoIJpGycOVf9-iHBo

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability one-engine-deterministic-text-segmentation-head-lines-p-16-tier-2-6a87fdc1 -d '<json body>'
```

Example prompt: I have a large block of text and I need just the first 16 lines back — can you run it through the head-lines segmentation utility at tier 2 diagnostics?

## When to prefer this

Choose this endpoint when you need a cheap, deterministic, pay-per-call utility to extract the leading lines of a text block and want basic diagnostic metadata (Tier 2). Prefer it over general-purpose LLM text summarization when you need exact line-boundary slicing with reproducible results rather than semantic summarization.

## Known failure modes

- Empty or missing text body returns an error or empty result
- Text with fewer than 16 lines returns all available lines without error
- Malformed POST body may result in a 400 Bad Request
- Payment not provided or insufficient USDC balance triggers 402 Payment Required via x402 protocol
- Network timeout on very large text inputs

## How this service works

Deterministic text segmentation utility: Return first lines; parameter=16. Tier 2/10 provides progressively richer diagnostics.

## Output

Returns the first 16 lines of the submitted text along with Tier 2 diagnostic metadata, which includes progressively richer segmentation diagnostics such as line counts, boundary positions, and processing context.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-deterministic-text-segmentation-head-lines-p-16-tier-2-6a87fdc1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from one-search.one-engine.workers.dev](https://www.zero.xyz/host/one-search.one-engine.workers.dev/llms.txt)